Jeans mass
= Jeans mass
{c}
{title2=$M_J$}
{wiki}
The Jeans mass is the characteristic gas mass above which self-gravity overcomes pressure support. Up to the convention used to define the collapsing region,
$$
M_J\propto\frac{c_s^3}{G^{3/2}\rho^{1/2}}
\propto T^{3/2}\rho^{-1/2}
$$
for an ideal gas of fixed composition.